diff --git a/app/models/attribute.py b/app/models/attribute.py
index 0219ea6..1bdc837 100644
--- a/app/models/attribute.py
+++ b/app/models/attribute.py
@@ -2,6 +2,6 @@ from pydantic import BaseModel
 from typing import Optional
 
 class Attribute(BaseModel):
-  value: str
+  value: Optional[str]
   type: Optional[str]
   id: str